Worry abt ret placenta13 wk pp.passed yellow mucus/clumps of tissue.nauseous.low milk supply.no fever/odor.dr said no worries unless fever/odor. true?

Yes true: Retained placenta usually causes persistant cramping and bleeding and wouldn't affect your milk supply. However, if you can save some of the tissue in a clean zip lock, your gyn can send it to pathology to confirm what it is. This might just be membranous endometrium. In addition check a pregnancy test as this could be a new pregnancy. Breast feeding isn't protecting you anymore.